KNF · Knife River Corp

Track KNF — free

$66.40 +0.48 (+0.73%) At close · Aug 14

Market Cap

$3.77B

56.76M

Options Chain

Underlying $66.40 · at close Aug 14, 2026 Options Calculator

Positioning

Aug 21, 2026 · 5 days to expiry · 40 contracts · mixed snapshot sessions · Jan 30, 2026–Aug 13, 2026; 14 unknown

Put / call OI

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dated and unknown snapshot sessions

Open interest

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dated and unknown snapshot sessions

Volume

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dated and unknown snapshot sessions

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 5d Sep 18 33d Nov 20 96d Feb 19 187d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	—	169.3%	0.994	—		$1.72	-0.039	254.1%	1	1
Call · $40 In the money Snapshot session Unknown Last — Breakeven — Implied vol 169.3% Delta 0.994 ≈99% ITM Gamma 0.001 Theta -0.023 Vega 0.001 Open interest 0 Model this call Put · $40 Snapshot session Jan 30, 2026 Last $1.72 Breakeven $38.28 Implied vol 254.1% Delta -0.039 ≈4% ITM Gamma 0.004 Theta -0.155 Vega 0.006 Open interest 1 Model this put
0	—	152.2%	0.985	—		$0.70	-0.046	201.4%	1	1
Call · $45 In the money Snapshot session Unknown Last — Breakeven — Implied vol 152.2% Delta 0.985 ≈98% ITM Gamma 0.003 Theta -0.047 Vega 0.003 Open interest 0 Model this call Put · $45 Snapshot session Feb 17, 2026 Last $0.70 Breakeven $44.30 Implied vol 201.4% Delta -0.046 ≈5% ITM Gamma 0.006 Theta -0.142 Vega 0.007 Open interest 1 Model this put
0	—	—	—	—		$0.15	-0.063	161%	1	31
Call · $50 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $50 Snapshot session Aug 5, 2026 Last $0.15 Breakeven $49.85 Implied vol 161% Delta -0.063 ≈6% ITM Gamma 0.009 Theta -0.146 Vega 0.013 Open interest 31 Model this put
1	2	81.4%	0.974	$14.20		$1.25	-0.099	125.6%	1	5
Call · $55 In the money Snapshot session Aug 4, 2026 Last $14.20 Breakeven $69.20 Implied vol 81.4% Delta 0.974 ≈97% ITM Gamma 0.009 Theta -0.041 Vega 0.004 Open interest 1 Model this call Put · $55 Snapshot session May 22, 2026 Last $1.25 Breakeven $53.75 Implied vol 125.6% Delta -0.099 ≈10% ITM Gamma 0.017 Theta -0.16 Vega 0.013 Open interest 5 Model this put
0	—	58.3%	0.926	—		$0.30	-0.172	91.8%	5	6
Call · $60 In the money Snapshot session Unknown Last — Breakeven — Implied vol 58.3% Delta 0.926 ≈93% ITM Gamma 0.029 Theta -0.065 Vega 0.014 Open interest 0 Model this call Put · $60 Snapshot session Aug 10, 2026 Last $0.30 Breakeven $59.70 Implied vol 91.8% Delta -0.172 ≈17% ITM Gamma 0.034 Theta -0.171 Vega 0.021 Open interest 6 Model this put
3	3	49.4%	0.652	$24.30		$2.90	-0.37	59.7%	3	5
Call · $65 In the money Snapshot session May 5, 2026 Last $24.30 Breakeven $89.30 Implied vol 49.4% Delta 0.652 ≈65% ITM Gamma 0.092 Theta -0.14 Vega 0.032 Open interest 3 Model this call Put · $65 Snapshot session May 21, 2026 Last $2.90 Breakeven $62.10 Implied vol 59.7% Delta -0.37 ≈37% ITM Gamma 0.077 Theta -0.164 Vega 0.032 Open interest 5 Model this put
Underlying $66.40
28	2	66.8%	0.279	$0.65		$1.85	-0.764	56.6%	1	5
Call · $70 Snapshot session Aug 13, 2026 Last $0.65 Breakeven $70.65 Implied vol 66.8% Delta 0.279 ≈28% ITM Gamma 0.061 Theta -0.167 Vega 0.03 Open interest 28 Model this call Put · $70 In the money Snapshot session Aug 3, 2026 Last $1.85 Breakeven $68.15 Implied vol 56.6% Delta -0.764 ≈76% ITM Gamma 0.068 Theta -0.125 Vega 0.023 Open interest 5 Model this put
4	2	79.3%	0.119	$1.50		$8.76	-0.928	66.6%	2	37
Call · $75 Snapshot session Aug 4, 2026 Last $1.50 Breakeven $76.50 Implied vol 79.3% Delta 0.119 ≈12% ITM Gamma 0.03 Theta -0.117 Vega 0.016 Open interest 4 Model this call Put · $75 In the money Snapshot session Aug 10, 2026 Last $8.76 Breakeven $66.24 Implied vol 66.6% Delta -0.928 ≈93% ITM Gamma 0.026 Theta -0.063 Vega 0.009 Open interest 37 Model this put
7	3	109.6%	0.097	$0.05		$4.80	—	—	1	0
Call · $80 Snapshot session Aug 4, 2026 Last $0.05 Breakeven $80.05 Implied vol 109.6% Delta 0.097 ≈10% ITM Gamma 0.019 Theta -0.138 Vega 0.016 Open interest 7 Model this call Put · $80 In the money Snapshot session Jul 2, 2026 Last $4.80 Breakeven $75.20 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
30	1	171.3%	0.145	$1.30		—	-0.978	98.1%	—	0
Call · $85 Snapshot session Aug 3, 2026 Last $1.30 Breakeven $86.30 Implied vol 171.3% Delta 0.145 ≈15% ITM Gamma 0.016 Theta -0.29 Vega 0.016 Open interest 30 Model this call Put · $85 In the money Snapshot session Unknown Last — Breakeven — Implied vol 98.1% Delta -0.978 ≈98% ITM Gamma 0.007 Theta -0.034 Vega 0.005 Open interest 0 Model this put
126	100	223.4%	0.166	$1.00		$10.30	-0.96	135.9%	1	0
Call · $90 Snapshot session Aug 3, 2026 Last $1.00 Breakeven $91.00 Implied vol 223.4% Delta 0.166 ≈17% ITM Gamma 0.014 Theta -0.415 Vega 0.025 Open interest 126 Model this call Put · $90 In the money Snapshot session Feb 23, 2026 Last $10.30 Breakeven $79.70 Implied vol 135.9% Delta -0.96 ≈96% ITM Gamma 0.008 Theta -0.08 Vega 0.009 Open interest 0 Model this put
8	8	185.6%	0.074	$2.90		—	—	—	—	0
Call · $95 Snapshot session Jul 2, 2026 Last $2.90 Breakeven $97.90 Implied vol 185.6% Delta 0.074 ≈7% ITM Gamma 0.009 Theta -0.192 Vega 0.01 Open interest 8 Model this call Put · $95 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
15	6	194.7%	0.058	$1.50		$16.40	-0.985	151.8%	1	0
Call · $100 Snapshot session Jul 9, 2026 Last $1.50 Breakeven $101.50 Implied vol 194.7% Delta 0.058 ≈6% ITM Gamma 0.007 Theta -0.165 Vega 0.01 Open interest 15 Model this call Put · $100 In the money Snapshot session Feb 19, 2026 Last $16.40 Breakeven $83.60 Implied vol 151.8% Delta -0.985 ≈98% ITM Gamma 0.004 Theta -0.039 Vega 0.005 Open interest 0 Model this put
8	2	219.9%	0.062	$1.65		—	—	—	—	0
Call · $105 Snapshot session Jun 17, 2026 Last $1.65 Breakeven $106.65 Implied vol 219.9% Delta 0.062 ≈6% ITM Gamma 0.007 Theta -0.195 Vega 0.011 Open interest 8 Model this call Put · $105 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
9	2	230%	0.051	$3.00		—	-0.987	181.6%	—	0
Call · $110 Snapshot session May 6, 2026 Last $3.00 Breakeven $113.00 Implied vol 230% Delta 0.051 ≈5% ITM Gamma 0.005 Theta -0.176 Vega 0.011 Open interest 9 Model this call Put · $110 In the money Snapshot session Unknown Last — Breakeven — Implied vol 181.6% Delta -0.987 ≈99% ITM Gamma 0.003 Theta -0.041 Vega 0.002 Open interest 0 Model this put
13	5	255.6%	0.058	$3.30		—	—	—	—	0
Call · $115 Snapshot session May 1, 2026 Last $3.30 Breakeven $118.30 Implied vol 255.6% Delta 0.058 ≈6% ITM Gamma 0.005 Theta -0.215 Vega 0.011 Open interest 13 Model this call Put · $115 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
3	1	280.1%	0.063	$1.13		—	—	—	—	0
Call · $120 Snapshot session Mar 12, 2026 Last $1.13 Breakeven $121.13 Implied vol 280.1% Delta 0.063 ≈6% ITM Gamma 0.005 Theta -0.254 Vega 0.011 Open interest 3 Model this call Put · $120 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
1	1	297.2%	0.063	$1.15		—	—	—	—	0
Call · $125 Snapshot session Mar 20, 2026 Last $1.15 Breakeven $126.15 Implied vol 297.2% Delta 0.063 ≈6% ITM Gamma 0.005 Theta -0.268 Vega 0.011 Open interest 1 Model this call Put · $125 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	296.4%	0.047	—		—	—	—	—	0
Call · $130 Snapshot session Unknown Last — Breakeven — Implied vol 296.4% Delta 0.047 ≈5% ITM Gamma 0.004 Theta -0.215 Vega 0.012 Open interest 0 Model this call Put · $130 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
1	1	309.3%	0.046	$0.85		—	—	—	—	0
Call · $135 Snapshot session Apr 22, 2026 Last $0.85 Breakeven $135.85 Implied vol 309.3% Delta 0.046 ≈5% ITM Gamma 0.004 Theta -0.219 Vega 0.006 Open interest 1 Model this call Put · $135 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put

About this data

Each contract's last price, volume, greeks, implied volatility and open interest belongs to the snapshot session shown in its details; unknown means the provider omitted the timestamp. This chain has mixed snapshot sessions · Jan 30, 2026–Aug 13, 2026; 14 unknown. Cross-contract positioning totals are shown only when every returned row has the same known session. Bid and ask are not included on this plan.

In-the-money strikes are tinted, deepening toward the money, and the bar beside each open-interest figure scales to the heaviest strike shown.

Key facts CIK 1955520 CUSIP 498894104 13F (30d) 350 filings 346 filers Visit website Investor relations